The Transit Police are searching for 15 to 20 suspects, who attacked the driver at around 1 a.m. near the corner of Columbia Road and Geneva Avenue. But the bus did not have a security camera that would have helped identify the assailants. New buses carry cameras, but the T should outfit more older buses, too.

In addition, police should get more authority to arrest attackers. Right now, except for the most serious crimes, T police arriving at the scene can only issue a summons. The Legislature should approve a bill backed by the T police and drivers’ union that would allow officers to make immediate arrests for assault and battery. Although such authority wouldn’t have made a difference on Saturday — the attackers fled before police arrived — it could help in other cases.

Thankfully, the driver suffered only minor injuries. Easing arrests and adding cameras won’t prevent all assaults. But as part of a sustained effort to protect drivers, those measures would help not just T employees, but the public that relies on safe transportation.